Patents by Inventor Grover C. Lawson

Grover C. Lawson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Filter paper and method of making same
    Patent number: 4161422
    Abstract: A filter medium particularly adapted for use in an oil filter for an internal combustion engine having a water-laid web of fibers, at least 70% of which are cellulose, impregnated with resin in a pattern at its wire side to a depth of 15 to 45% of its total thickness, the pattern having zones free from resin amounting to 35 to 60% of the total area of the wire side, each zone having at least one dimension no greater than 4 mm.
    Type: Grant
    Filed: May 10, 1978
    Date of Patent: July 17, 1979
    Assignee: Hollingsworth & Vose Company
    Inventors: Grover C. Lawson, James C. Wilson
  • Filter medium and method of making same
    Patent number: 4119543
    Abstract: A filter medium particularly adapted for use in an oil filter for an internal combustion engine having a water-laid web of fibers, at least 70% of which are cellulose, impregnated with resin in a pattern at its wire side to a depth of 15 to 45% of its total thickness, the pattern having zones free from resin amounting to 35 to 60% of the total area of the wire side, each zone having at least one dimension no greater than 4 mm.
    Type: Grant
    Filed: July 8, 1977
    Date of Patent: October 10, 1978
    Assignee: Hollingsworth & Vose Company
    Inventors: Grover C. Lawson, James C. Wilson